On 2016-03-29 22:46+0200 Nils Gladitz wrote:
On 29.03.2016 21:39, Alan W. Irwin wrote:
One of the PLplot developers, Arjen Markus, has just reported to me
that ctest -j4 for PLplot hangs on his MinGW-w64/MSYS2 platform while
ctest works fine. This issue occurred for the
mingw64/mingw-w64-x86_64-cmake 3.4.1-1 package version of ctest.exe,
and the PLplot build was done with the "MSYS Makefiles" generator. In
contrast to the MinGW-w64/MSYS2 platform case, ctest -j4 works fine
for the Linux case.
Has anyone else here had similar difficulties OR success with the
parallel ctest option on the MinGW-w64/MSYS2 platform?
Afair there are sporadic issues with the cygwin runtime (on which msys/msys2
is based) in the process handling code of kwsys (used by cmake).
The code is used by e.g. execute_process() and also ctest for test execution.
I think the issue is due to how pipes are implemented by the runtime.
From what I remember rsync also suffers from this.
Also having Kaspersky installed (even when paused) seems to make these hangs
more likely.
Thanks, Nils, for that information. Could this issue be related to
the Cygwin unreliability mentioned in
<http://cygwin.com/cygwin-ug-net/highlights.html> where they say "In
summary, current Windows implementations make it impossible to
implement a perfectly reliable fork, and occasional fork failures are
inevitable."?
In any case, whatever the issue is, Arjen appears (so far) to have
found a reliable reproducer with the -j option for ctest. So I hope
others here try the -j option for ctest on MinGW-w64/MSYS2 platforms
for their favorite projects to get a better idea of how widespread
this issue is.
Alan
__________________________
Alan W. Irwin
Astronomical research affiliation with Department of Physics and Astronomy,
University of Victoria (astrowww.phys.uvic.ca).
Programming affiliations with the FreeEOS equation-of-state
implementation for stellar interiors (freeeos.sf.net); the Time
Ephemerides project (timeephem.sf.net); PLplot scientific plotting
software package (plplot.sf.net); the libLASi project
(unifont.org/lasi); the Loads of Linux Links project (loll.sf.net);
and the Linux Brochure Project (lbproject.sf.net).
__________________________
Linux-powered Science
__________________________
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